Just bought a Carlton Giro

So this week I managed 45 miles 3 x 9.3 mile loops and a a 17 mile ride on the Giro. The bottom bracket is definitely lower than the Corsa and Super Course. The front forks are more curved as well. I wonder if the position is more aerodynamic. Has anyone played with this height.
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It seems modern aero bikes are using a bb drop of between 66 and 78 which hasn't changed much. Although Cervelo's P5 time trial bike mentions a lower bottom bracket height than its predecessor to reduce drag.
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